From patchwork Thu Aug 6 16:56:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 11703615 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7A95E13B1 for ; Thu, 6 Aug 2020 16:57:28 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CF39B2086A for ; Thu, 6 Aug 2020 16:57:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CF39B2086A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:40590 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k3jCp-0002sc-Co for patchwork-qemu-devel@patchwork.kernel.org; Thu, 06 Aug 2020 12:57:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42224) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k3jC1-0000zA-6M for qemu-devel@nongnu.org; Thu, 06 Aug 2020 12:56:37 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:36353 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1k3jBz-00078i-I4 for qemu-devel@nongnu.org; Thu, 06 Aug 2020 12:56:36 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-425-MsC0VUH0MwOEAVL1nRk9wg-1; Thu, 06 Aug 2020 12:56:30 -0400 X-MC-Unique: MsC0VUH0MwOEAVL1nRk9wg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3DD5B8014C1; Thu, 6 Aug 2020 16:56:29 +0000 (UTC) Received: from bahia.lan (ovpn-112-38.ams2.redhat.com [10.36.112.38]) by smtp.corp.redhat.com (Postfix) with ESMTP id 421097B904; Thu, 6 Aug 2020 16:56:28 +0000 (UTC) Subject: [PATCH v2 for-5.2 4/5] spapr/xive: Convert KVM device fd checks to assert() From: Greg Kurz To: David Gibson Date: Thu, 06 Aug 2020 18:56:27 +0200 Message-ID: <159673298746.766512.8609128730730603233.stgit@bahia.lan> In-Reply-To: <159673295739.766512.2950380687630225803.stgit@bahia.lan> References: <159673295739.766512.2950380687630225803.stgit@bahia.lan> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Received-SPF: softfail client-ip=207.211.31.81; envelope-from=groug@kaod.org; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/06 05:03:13 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Henrique Barboza , qemu-ppc@nongnu.org, =?utf-8?q?C=C3=A9dric_Le_Goater?= , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" All callers guard these functions with an xive_in_kernel() helper. Make it clear that they are only to be called when the KVM XIVE device exists. Note that the check on xive is dropped in kvmppc_xive_disconnect(). It really cannot be NULL since it comes from set_active_intc() which only passes pointers to allocated objects. Signed-off-by: Greg Kurz Reviewed-by: David Gibson --- v2: Take the helper name change into account in the changelog --- hw/intc/spapr_xive_kvm.c | 35 +++++++---------------------------- 1 file changed, 7 insertions(+), 28 deletions(-) diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c index 893a1ee77e70..1908afb14b9f 100644 --- a/hw/intc/spapr_xive_kvm.c +++ b/hw/intc/spapr_xive_kvm.c @@ -79,10 +79,7 @@ void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp) uint64_t state[2]; int ret; - /* The KVM XIVE device is not in use yet */ - if (xive->fd == -1) { - return; - } + assert(xive->fd != -1); /* word0 and word1 of the OS ring. */ state[0] = *((uint64_t *) &tctx->regs[TM_QW1_OS]); @@ -101,10 +98,7 @@ void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp) uint64_t state[2] = { 0 }; int ret; - /* The KVM XIVE device is not in use */ - if (xive->fd == -1) { - return; - } + assert(xive->fd != -1); ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state); if (ret != 0) { @@ -156,10 +150,7 @@ void kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp) unsigned long vcpu_id; int ret; - /* The KVM XIVE device is not in use */ - if (xive->fd == -1) { - return; - } + assert(xive->fd != -1); /* Check if CPU was hot unplugged and replugged. */ if (kvm_cpu_is_enabled(tctx->cs)) { @@ -245,10 +236,7 @@ int kvmppc_xive_source_reset_one(XiveSource *xsrc, int srcno, Error **errp) SpaprXive *xive = SPAPR_XIVE(xsrc->xive); uint64_t state = 0; - /* The KVM XIVE device is not in use */ - if (xive->fd == -1) { - return -ENODEV; - } + assert(xive->fd != -1); if (xive_source_irq_is_lsi(xsrc, srcno)) { state |= KVM_XIVE_LEVEL_SENSITIVE; @@ -592,10 +580,7 @@ static void kvmppc_xive_change_state_handler(void *opaque, int running, void kvmppc_xive_synchronize_state(SpaprXive *xive, Error **errp) { - /* The KVM XIVE device is not in use */ - if (xive->fd == -1) { - return; - } + assert(xive->fd != -1); /* * When the VM is stopped, the sources are masked and the previous @@ -622,10 +607,7 @@ int kvmppc_xive_pre_save(SpaprXive *xive) { Error *local_err = NULL; - /* The KVM XIVE device is not in use */ - if (xive->fd == -1) { - return 0; - } + assert(xive->fd != -1); /* EAT: there is no extra state to query from KVM */ @@ -845,10 +827,7 @@ void kvmppc_xive_disconnect(SpaprInterruptController *intc) XiveSource *xsrc; size_t esb_len; - /* The KVM XIVE device is not in use */ - if (!xive || xive->fd == -1) { - return; - } + assert(xive->fd != -1); /* Clear the KVM mapping */ xsrc = &xive->source;